Château Nenin is a large property by Pomerol standards and one which has long been a favourite of the British Royal Family. Nenin was owned by the Despujol family until 1997 when it was bought by Jean-Hubert and Michel Delon, the proprietors of Château Léoville-Las-Cases. Michel Rolland has been retained as a consultant and the wines are now cleaner and displaying more depth of fruit than before. Nenin is located just outside the village of Catusseau and consists of a handsome, 19th century château and a 25 hectare vineyard set in a large park. The vineyard is south-west facing and located on a high plateau, where the soils are a mixture of deep gravels and sand. Nenin is a blend of 70% Merlot, 20% Cabernet Franc and 10% Cabernet Sauvignon. The grapes are machine-harvested and then fermented in temperature-controlled, stainless steel vats. The wine is then matured in oak casks (50% new) for 18 months.

The Pomerol region is located at the northern border where viticulture was present in the area during the time of the Romans. Though it is uncertain as to the origins of the name "Pomerol", but it is speculated that the word was derived from the Latin word poma, which refers to a fruit bearing seeds and is the origin of the French word pomme, meaning apple. This theory is supported by the region's long history of polyculture with many other crops, particularly fruits and grains, being cultivated in the area long before viticulture became a primary focus.